Cannot resolve string supplied to vararg parameter in extension function

Question

strings.xml

Showing your number: %1$s

ActivityExt.kt

Answer 1

Use the spread operator:

fun Activity.showToast(textResId: Int, vararg formatArgs: String) {
    val text = getString(textResId, *formatArgs)
    Toast.makeText(this, text, Toast.LENGTH_SHORT).show()
}

Currently, you're passing an array as the format argument. By using the spread operator you pass the contents of the array as the format argument.